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2 years ago

7

In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped

with a mean of $33 and a standard deviation of $16. Construct a confidence interval at a 98% confidence level.
Give your answers to one decimal place

1 answer:

Lesechka [4]2 years ago

6 0

Answer:

The margin of error is 5. 00

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How to do 3 4/5 ÷ 1 1/3

andrew11 [14]

Answer: 2 7/15

Step-by-step explanation: First, you make sure you have the same denominator on both of the fractions.

4/5 turns to 12/15 and 1/3 turns to 5/15

After that, then you do 12/15 - 5/15, which is 7/15.

Now you do 3 - 1.

Your answer should be 2 7/15.

I hope this helps you and I hope you have a blessed day!

8 0

3 years ago

A model rocket is launched with an initial upward velocity of 138 ft/s. The rocket's height h (in feet) after 1 seconds is given

insens350 [35]

Answer:

t = 8.017 or 0.608 (nearest hundredth)

Step-by-step explanation:

$h = 138t-16t^2$

when h = 78:

$\implies 138t-16t^2=78$

$\implies 16t^2-138t+78=0$

Using quadratic formula:

$t=\dfrac{138 \pm\sqrt{(-138)^2-(4 \cdot 16 \cdot 78)} }{2 \cdot 16}$

$\implies t=\dfrac{138 \pm\sqrt{14052} }{32}$

$\implies t=8.017, t = 0.608$

8 0

1 year ago

HELP HELP HURRY!!!!!

irinina [24]

If the entire ray is PQ, then all of those points lie on the ray.

4 0

3 years ago

Read 2 more answers

A university offers 3 calculus classes: Math 2A, 2B and 2C. In both parts, you are given data about a group of students who have

ankoles [38]

Answer:

4 students

Step-by-step explanation:

The total number of students is given by:

$|A|+|B|+|C|-|A\cap B|-|A\cap C|-|B\cap C| + |A\cap B \cap C| = N$

Where N is the total number of students, A is the number of students that have taken Math 2A, B is the number of students that have taken Math 2B, and C is the number of students that have taken Math 2C:

$|A|+|B|+|C|-|A\cap B|-|A\cap C|-|B\cap C| + |A\cap B \cap C| = N\\51+80+70-15-20-13 + |A\cap B \cap C| = 157\\ |A\cap B \cap C| =4$

4 students in Group A have taken all three classes.

*The number of students that have taken two classes has be subtracted so those students do not get counted twice

4 0

3 years ago

In the track meet I competed in the high jump and the pole vault. What is this called?

nata0808 [166]

Answer:

Within the parlance of Statistics, this is called Nominal Data.

Other examples of nominal data are:

Race
Country
Gender etc

Cheers

5 0

2 years ago